DE102012018141B4 - SCR module - Google Patents

Abstract

SCR module (1) for a reciprocating internal combustion engine (3), comprising - a housing and / or a frame, - an exhaust line (7) which delimits a flow channel for the passage of exhaust gas, with an inlet opening (8) for introducing the Exhaust gas and an outlet opening (9) for discharging the exhaust gas, - disposed within the flow channel SCR catalyst (10), - at least one injection element (11) for adding a reducing agent, for. As ammonia or a urea solution, to the guided through the flow channel exhaust gas, characterized in that the SCR module (1) comprises at least one conveying device (13) for supplying the reducing agent to the injection element (11) with a predetermined pressure.

Description

The present invention relates to an SCR module according to the preamble of claim 1, an internal combustion engine system according to the preamble of claim 6 and a method for manufacturing an internal combustion engine system according to the preamble of claim 14.

Reciprocating internal combustion engines are used for a wide variety of applications. In stationary systems reciprocating internal combustion engines used in combination with a generator, for example, for power generation. In mobile systems reciprocating internal combustion engines are used to drive ships, military vehicles, such as tanks, or to drive for agricultural vehicles. The reciprocating internal combustion engines should have the lowest possible emissions of nitrogen oxides. It is known to selectively reduce the nitrogen oxides in the exhaust gases on an SCR catalyst by means of a selective catalytic reaction (SCR). As a result, the emission of nitrogen oxides (NO _x ) can be significantly reduced. Ammonia (NH ₃ ) is required to complete this reaction and the products of the reaction are water (H ₂ O) and nitrogen (N ₂ ). As SCR catalysts, for example, catalysts of titanium dioxide, vanadium pentoxide and tungsten dioxide are used or other types of SCR catalysts, eg. Using zeolites. The ammonia required for the reaction is not added directly or in pure form, but as a 32.5% aqueous urea solution and is referred to in the automotive industry as Adblue.

Internal combustion engine systems are therefore provided with means for the selective catalytic reduction of the exhaust gases. It is necessary for reciprocating internal combustion engines with a different power, such as a power between 600 and 4000 kW, to provide appropriate facilities for selective catalytic reduction available in a complex manner, which withdraw the volume flow of reciprocating internal combustion engines exhaust gas in a sufficient manner nitrogen oxides or can reduce. For this reason, it is necessary to provide for reciprocating internal combustion engines with different power correspondingly different facilities in a complex and expensive way. As a result, the costs for the production of internal combustion engine systems are greatly increased and there is also a complex, costly and error-prone assembly effort in the production of the internal combustion engine system.

From the DE 43 10 962 C1 is known an exhaust system for several independently operable internal combustion engines. The exhaust gas is passed into a common exhaust pipe, wherein the denitrification of the exhaust gas is effected by a selective catalytic reduction by adding a reducing agent in the exhaust gas stream. The common exhaust pipe branches into at least two branch lines, in which at least one SCR catalyst is arranged and at least a part of the branch lines is shut off by means of adjustable shut-off valves depending on the operating state of the internal combustion engines.

The DE 10 2010 021 438 A1 shows an exhaust aftertreatment device, in particular for a diesel engine, which is traversed by an exhaust gas stream in an exhaust gas flow direction and an exhaust gas inlet, a reducing agent addition system for adding reducing agent in the exhaust gas stream, a nitrogen oxide reduction catalyst and an exhaust outlet, wherein the reducing agent addition system at least two reducing agent addition devices, in particular injection nozzles , having.

From the DE 10 2005 025 045 A1 is an exhaust system for an internal combustion engine, in particular in a motor vehicle, known. The exhaust system includes an SCR module and a particulate filter module. The SCR module is provided with an SCR catalyst element and a urea dosing device.

The DE 10 2005 025 045 A1 shows an exhaust system for an internal combustion engine. The exhaust system includes an SCR module including at least one SCR catalyst element in an SCR housing connected to an exhaust line, a PF module containing at least one particulate filter element in a PF housing connected to the exhaust line upstream of the SCR housing.

From the DE 10 2009 009 711 A1 is known an exhaust gas purification device for motor vehicles. This comprises a tank for a fluid reducing agent, a nozzle opening into the exhaust gas flow for injecting the reducing agent, a pump for pumping the reducing agent to the nozzle and a flow meter for the reducing agent.

The DE 10 2011 002 987 A1 shows a Reduktionsmittelzuführeinrichtung for an exhaust system of an internal combustion engine, comprising a plurality of injectors for introducing a reducing agent in an exhaust gas stream, a supply line for supplying the injectors with reducing agent, a conveyor and a controller.

The object of the present invention is therefore an SCR module, a To provide an internal combustion engine system and a method for producing an internal combustion engine system in which reciprocating internal combustion engines with different powers can be easily, reliably and inexpensively equipped with a device for the selective catalytic reduction of the exhaust gases.

This object is achieved with an SCR module for a reciprocating internal combustion engine, comprising a housing and / or a frame, an exhaust line, which delimits a flow channel for passing exhaust gas, with an inlet opening for introducing the exhaust gas and an outlet opening for discharging the exhaust gas , an SCR catalyst disposed within the flow channel, at least one injection element for adding a reducing agent, e.g. As ammonia or a urea solution, to the guided through the flow channel exhaust gas, wherein the SCR module comprises at least one conveying device for supplying the reducing agent to the injection element with a predetermined pressure.

The injection element requires the reducing agent under a certain, predetermined pressure. For this reason, the SCR module is provided with at least one conveying device, in particular for each one injection element. Thus, the SCR module for the selective catalytic reaction requires only the reducing agent with a non-predetermined pressure. In a simple manner, the SCR module can thereby be used in an internal combustion engine system, since only one exhaust pipe and one reducing agent line have to be connected to the SCR module. The SCR module can be used very easily during assembly and a separate mounting a conveyor is thus no longer required on the SCR module.

In particular, the at least one delivery device as a pump, preferably piston pump or turbomachine, for. B. centrifugal pump, and / or the predetermined pressure is in the range of 8 to 12 bar and / or the at least one conveying device is integrated into the SCR module and / or installed. The at least one conveyor is integrated and / or installed in the SCR module, i. H. integral part of the SCR module and, for example, with a permanent connection, for. B. a welded or riveted joint, or a releasable connection, for. As a screw or clip connection, with the rest of the SCR module, z. As a frame and / or a housing connected.

In a further embodiment, the SCR module comprises a reducing agent line, in particular the SCR module comprises at least one reducing agent supply line for conducting the liquid or gaseous reducing agent from the conveying device to the at least one injection element and the SCR module comprises at least one reducing agent return line for discharging the excess reducing agent from the at least one injection element. In general, the reducing agent is supplied to the injection element in a circulation system, so that a reducing agent fore and a reducing agent return line, in particular for each injection element, is required.

In a supplementary embodiment, the SCR module comprises at least one pressure sensor for detecting the pressure of the reducing agent supplied to the at least one injection element. With the pressure sensor, the pressure of the reducing agent supplied to the injection element is detected, for example, at the reducing agent supply line or at the injection element. Depending on the pressure of the reducing agent detected by the pressure sensor, the control unit controls and / or regulates the at least one conveying device in the conveying capacity of a control and / or regulating unit of an internal combustion engine system.

Preferably, the SCR module comprises a hydraulic interface for supplying the SCR module with the reducing agent and / or the SCR module comprises an electrical interface for the electrical connection of the SCR module, for. B. for power and / or data exchange. The hydraulic interface has devices for fluid-tight conduction of the reducing agent in the SCR module. For example, it is an SAE J2044. The electrical interface is designed, for example, as a Harting plug.

Suitably, the SCR module has an exhaust port, z. For example, an exhaust pipe socket or designed for example as ASME exhaust flange exhaust port.

Inventive internal combustion engine system, comprising a reciprocating internal combustion engine, in particular only one reciprocating internal combustion engine, a plurality of SCR modules for exhaust gas treatment, an exhaust pipe for guiding the exhaust gas from the reciprocating internal combustion engine to the SCR module, wherein the SCR modules, in particular all SCR Modules, are connected in parallel with respect to the exhaust gas and the plurality of SCR modules each have a housing and / or a frame, an exhaust line, which delimits a flow channel for passing exhaust gas, with an inlet opening for introducing the exhaust gas and an outlet opening for discharging the exhaust gas, an arranged within the flow channel SCR catalyst, at least one injection element for Addition of a reducing agent, eg. As ammonia or a urea solution, to the exhaust gas passed through the flow channel, at least one conveying device for supplying the reducing agent to the injection element with a predetermined pressure.

The internal combustion engine system has a plurality of SCR modules that are connected in parallel with respect to the exhaust gas. As a result, with the use of reciprocating internal combustion engines with a different power, for example in the range between 600 and 4000 kW, the volume flow of the exhaust gas of the reciprocating internal combustion engine can be selectively reduced catalytically by the use of a corresponding number of SCR modules. The SCR modules and the exhaust pipe as an exhaust system can be adapted in a particularly simple manner to different performances or exhaust gas flow rates of reciprocating internal combustion engines only by using a different number of SCR modules for selective catalytic reduction in the exhaust system.

In one variant, the SCR modules of the internal combustion engine system are embodied as SCR modules described in this patent application and / or the exhaust line has a branch for the parallel conduction of the exhaust gas from the reciprocating internal combustion engine into the SCR modules.

Suitably, the SCR modules are identical and / or the reciprocating internal combustion engine is a diesel engine. The SCR modules are identical or essentially identical. In order to provide a corresponding exhaust system available for reciprocating internal combustion engines with a different performance, so only one type of SCR modules must be produced and used in an advantageous manner. The cost of manufacturing the SCR modules is thereby greatly simplified and reduced because only one type of SCR module is used for reciprocating internal combustion engines in a certain power range. Furthermore, during the assembly of the internal combustion engine system, a simpler connection and assembly of the SCR modules with each other is made possible because only identical SCR modules are used.

In a further embodiment, the SCR modules comprise identical exhaust strands and / or identical SCR catalysts and / or identical exhaust gas interfaces for introducing and removing the exhaust gas and / or identical hydraulic interfaces and / or identical electrical interfaces.

In particular, the internal combustion engine system comprises a reducing agent interface, in particular only a reducing agent interface for hydraulic connection with a reducing agent tank and / or the internal combustion engine system comprises a particulate filter for the exhaust gas and / or in the exhaust pipe is not a shut-off, z. As a shut-off valve or a stopcock, in particular for individual SCR modules arranged. The reducing agent tank is not part of the internal combustion engine system and with the reducing agent interface, the entire engine system can be supplied with the reducing agent, i. H. the SCR modules. No shut-off valve is installed in the exhaust pipes of the SCR modules, so that all SCR modules can constantly flow through or pass through the exhaust gas of the reciprocating internal combustion engine. The number of SCR modules is designed so that they can reduce the volume flow of the reciprocating internal combustion engine exhaust sufficiently selective catalytic.

In another embodiment, the reductant interface with a reductant main supply line and a reductant main return line is hydraulically connected to the SCR modules, in particular all SCR modules, in particular the reductant main supply line and the reducing agent main return line are hydraulically connected to the hydraulic interfaces on the SCR modules. Through the Reduktionsmittelhauptvor- and return line all SCR modules with the reducing agent interface and thus also with the reducing agent tank can be hydraulically connected, so that thereby a particularly simple hydraulic connection between the reducing agent tank and the SCR modules for supply of reducing agent is possible.

In a supplementary variant, the internal combustion engine system comprises a control and / or regulating unit, in particular only one control and / or regulating unit, for the SCR modules and preferably for the reciprocating internal combustion engine.

In a further variant, the control and / or regulating unit with at least one control and / or main power line is electrically connected to the SCR modules, in particular all SCR modules, and the at least one control and / or main power line is electrically connected to the electrical Interfaces of the SCR modules connected. With the control unit, the reciprocating internal combustion engine is controlled and / or regulated in addition to the SCR modules. In particular, the injection element is controlled and / or regulated with the control and / or regulating unit, so that a sufficient volume flow of reducing agent is supplied to the exhaust gas flowing through the SCR modules as a function of the volumetric flow of exhaust gas flowing through the SCR modules.

Method according to the invention for producing an internal combustion engine system, in particular an internal combustion engine system described in this patent application, comprising the steps of: providing at least one reciprocating internal combustion engine, in particular only one reciprocating internal combustion engine, making available several SCR modules, making available an exhaust pipe, connecting the exhaust pipe with the reciprocating internal combustion engine and the SCR module, the multiple SCR modules are connected in parallel with respect to the exhaust gas with the exhaust pipe to the reciprocating internal combustion engine and the multiple SCR modules are provided so that the SCR modules in each case a housing and / or a frame, an exhaust line, which delimits a flow channel for the passage of exhaust gas, with an inlet opening for introducing the exhaust gas and an outlet opening for discharging the exhaust gas, a disposed within the flow channel SCR cat alysator, at least one injection element for adding a reducing agent, for. As ammonia or a urea solution, to the exhaust gas passed through the flow channel, at least one conveying device for supplying the reducing agent to the injection element with a predetermined pressure.

In a further embodiment, the SCR modules are provided to the effect that the SCR modules are designed as SCR modules described in this patent application and / or identical SCR modules are made available and / or the SCR modules are identical to one another Exhaust strands and / or identical SCR catalysts and / or identical exhaust gas interfaces for introducing and discharging the exhaust gas and / or identical hydraulic interfaces and / or identical electrical interfaces provided and / or the greater the power of the reciprocating internal combustion engine or the performance of The sum of the reciprocating internal combustion engines, the more SCR modules is provided and vice versa and are connected in parallel with the reciprocating internal combustion engine with respect to the exhaust gas.

Suitably, the reciprocating internal combustion engine and / or the SCR module and / or the exhaust pipe is made available and / or produced by only one company. The internal combustion engine system is thus provided and / or manufactured by only one company, so that, for example, the delivery and installation of the internal combustion engine system is carried out by only one company.

In a further embodiment, the reducing agent line, the reducing agent main supply line and preferably the reducing agent interface and preferably the hydraulic interface and preferably the hydraulic counter interface comprise an electrical heating device, so that a frozen reducing agent can be thawed with the electric heating device.

In the following, an embodiment of the invention will be described in more detail with reference to the accompanying drawings. It shows:

1 a perspective view of several SCR modules,

2 a hydraulic and electrical diagram of the SCR modules according to 1 and

3 a schematic representation of an internal combustion engine system with the SCR modules according to 1 and 2 ,

An in 3 illustrated internal combustion engine system 2 includes in addition to a reciprocating internal combustion engine 3 as a diesel engine also a generator 4 that by means of a drive shaft 5 from the reciprocating internal combustion engine 3 is driven. The internal combustion engine system 2 is thus a stationary plant and used to generate electricity. Deviating from this, the internal combustion engine system 2 even in a mobile plant without the generator 4 be used, for. B. to drive a ship, a military vehicle, z. As a tank, or to drive an agricultural utility vehicle.

The internal combustion engine system 2 further includes a particulate filter 6 and three SCR modules 1 , That from the reciprocating internal combustion engine 3 effluent exhaust gas is passed through an exhaust pipe 24 first through the particle filter 6 passed to deposit particles, and then from the particulate filter 6 to the three SCR modules 1 directed. The exhaust pipe 24 is with a branch 25 provided and in the exhaust pipe 24 is not a shut-off, z. As a shut-off valve, arranged so that during operation of the internal combustion engine system 2 all of the three SCR modules 1 constantly from the exhaust gas from the reciprocating internal combustion engine 3 are flowed through or can be flowed through.

The SCR modules 1 are identical. Each of the SCR modules 1 has two injectors 12 as injection elements 11 and an exhaust system 7 for passing the exhaust gas through the SCR module. The exhaust system 7 has an inlet opening 8th for introducing the exhaust gas and an outlet opening 9 for discharging the exhaust gas ( 3 ) on. The inlet and outlet opening 8th . 9 is doing on an exhaust pipe socket 23 formed, which thereby an exhaust port 22 to connect the exhaust pipe 24 formed. Here are the exhaust gas interfaces 22 identically formed, z. B. as ASME exhaust flanges. For the three SCR modules 1 thus becomes an exhaust pipe 24 with corresponding connection interfaces for connection to the exhaust gas interfaces 22 needed and these connection interfaces on the exhaust pipes 24 are in an advantageous and simple way identical, since the identical exhaust gas interfaces 22 on the SCR modules 1 available.

Each of the two injectors 12 in an SCR module 1 is one each as a pump 14 trained conveying device 13 assigned so that each of the SCR modules 1 two conveyors 13 ( 1 and 2 ) having. In 3 For reasons of simplicity, these are just one of the two pumps 14 and injection elements 11 shown. By means of the pumps 14 is the reducing agent, ie a 32.5% urea solution with ammonia under a pressure of in the range of 10 bar the injectors 12 provided with a constant pressure. The reducing agent becomes the injectors 12 fed in a circuit, so that through a reducing agent supply line 16 as a reducing agent line 15 on the SCR modules 1 the reducing agent to the injectors 12 fed and the unused or uninjected portion of the reducing agent through a reducing agent return line 17 as a reducing agent line 15 again from the injector 12 and also the SCR module 1 is derived or deduced ( 1 and 2 ). The reducing agent also serves as a coolant for the injection elements 11 , so no compressed air for cooling the injection elements 11 is required. For reasons of simplification are in 3 the reductant supply and return lines 16 . 17 only as a reductant line 15 shown in simplified form. Each SCR module has it 1 via a hydraulic interface 18 by means of the reducing agent from a reducing agent main line 28 serving as the reductant main feed line 29 and as the reductant main return line 30 is trained, ( 1 and 2 ) the pumps 14 can be supplied. In this case, the reducing agent main lines 28 a hydraulic counter interface 19 on and the hydraulic interface 18 on the SCR module 1 is with the hydraulic counter interface 19 at the reductant main 28 hydraulically connected. These can be separate hydraulic interfaces 18 respectively for the reducing agent supply and return line 16 . 17 Act or with only one hydraulic interface 18 per SCR module, the reducing agent supply and return lines 16 . 17 with the reducing agent main supply line 29 and reductant main return line 30 hydraulically disconnected electrically connected. The reductant main 28 is with a reducing agent interface 26 with a reducing agent tank 27 hydraulically connected. The internal combustion engine system 2 has only one reducing agent interface 26 on, by means of all the SCR modules 1 can be supplied with the reducing agent. For this purpose, the reducing agent main line 28 corresponding branches on to the three hydraulic interfaces 18 on the three SCR modules 1 ,

The internal combustion engine system 2 has a control and / or regulating unit 31 on. The control and / or regulating unit 31 serves to control and / or regulation of the reciprocating internal combustion engine 3 , z. As the power and / or the speed and / or the λ value of the reciprocating internal combustion engine 3 , Furthermore, with the control and / or regulating unit 31 also the SCR modules 1 controlled and / or regulated, in particular the flow rate of the pump 14 and the injection times and / or the injection volume flow of reducing agent with the injection nozzles 12 , For this purpose, the control and / or regulating unit 31 with a control and / or power main 32 , which branches off accordingly, with electrical interfaces 20 on the SCR modules 1 connected. At the control and / or power mains 32 is after the branches each an electrical counter interface 34 educated. Here are the electrical counterparts 34 at the branched control and / or power main lines 32 with the electrical interfaces 20 on the SCR modules 1 connected. The electrical interfaces 20 are thus part of the SCR modules 1 like the hydraulic interfaces 18 , The electrical interfaces 20 are for example as electrical plugs 21 trained and the electrical counterparts 34 as electrical mating connector. From the electrical interfaces 20 on the SCR modules 1 lead control and / or power lines 33 to the conveyors 13 and the injection elements 11 ( 1 to 3 ).

Within one of the exhaust line 7 limited flow channel is in each case an SCR catalyst 10 , z. B. of titanium dioxide, vanadium pentoxide and tungsten dioxide, arranged. During the passage of the exhaust gas through the exhaust line 7 is by means of the injection elements 11 fed into the exhaust stream, the reducing agent, thereby characterized in the SCR catalyst 10 the nitrogen oxides (NO, NO ₂ ) contained in the exhaust gas can be substantially reduced, so that as products of this reaction, water and nitrogen from the outlet opening 9 on the SCR module 1 flows.

Overall, with the inventive SCR module 1 and the internal combustion engine system according to the invention 2 significant benefits. On the internal combustion engine system 2 will only be identical SCR modules 1 used. To adapt to different capacities and thus flow rates of exhaust gases of the reciprocating internal combustion engine 3 This only requires the number of SCR modules 1 varied or changed, for. Between one and five SCR modules 1 , The required device for selective catalytic reduction, ie the SCR modules 1 , can match the performance of the reciprocating internal combustion engine 3 , z. B. with a power between 600 and 4000 kW, only by the arrangement of a corresponding number of SCR modules 1 be adjusted.

The SCR modules 1 have identical exhaust gas interfaces 22 , identical hydraulic interfaces 18 and identical electrical interfaces 20 on, so when connecting and mounting the SCR modules 1 This is particularly easy with the exhaust pipe 24 , the reductant main 28 and the control and / or power main 32 can be connected. Furthermore, the aforementioned interfaces are designed according to the so-called Poka-Yoke system, so that a faulty connection of the SCR modules 1 can essentially be excluded. Due to the identical design of the SCR modules 1 may be the production of the SCR modules 1 be substantially reduced in cost, as for reciprocating internal combustion engines 3 only one type of SCR module in a given power range 1 must be made. The effort during assembly and commissioning is thereby substantially reduced, so that in the manufacture and assembly of the internal combustion engine system 2 also the so-called delegated assembly is possible.

Claims (15)

SCR module ( 1 ) for a reciprocating internal combustion engine ( 3 ), comprising - a housing and / or a frame, - an exhaust line ( 7 ), which defines a flow channel for the passage of exhaust gas, with an inlet opening ( 8th ) for introducing the exhaust gas and an outlet opening ( 9 ) for discharging the exhaust gas, - an SCR catalyst arranged inside the flow channel ( 10 ), - at least one injection element ( 11 ) for adding a reducing agent, e.g. As ammonia or a urea solution, to the guided through the flow channel exhaust gas, characterized in that the SCR module ( 1 ) at least one conveying device ( 13 ) for supplying the reducing agent to the injection element ( 11 ) at a predetermined pressure. SCR module according to claim 1, characterized in that the at least one conveying device ( 13 ) as a pump ( 14 ), preferably piston pump or turbomachine, z. B. centrifugal pump, is formed and / or the predetermined pressure in the range of 8 to 12 bar and / or the at least one conveying device ( 13 ) into the SCR module ( 1 ) is integrated and / or installed. SCR module according to claim 1 or 2, characterized in that the SCR module ( 1 ) a reducing agent line ( 15 ), in particular the SCR module ( 1 ) at least one reducing agent supply line ( 16 ) for conducting the liquid or gaseous reducing agent from the conveying device ( 13 ) to the at least one injection element ( 11 ) and the SCR module ( 1 ) at least one reducing agent return line ( 17 ) for discharging the excess of the reducing agent from the at least one injection element ( 11 ). SCR module according to one or more of the preceding claims, characterized in that the SCR module ( 1 ) at least one pressure sensor for detecting the pressure of the at least one injection element ( 11 ) supplied reducing agent. SCR module according to one or more of the preceding claims, characterized in that the SCR module ( 1 ) a hydraulic interface ( 18 ) for the supply of the SCR module ( 1 ) with the reducing agent and / or the SCR module ( 1 ) an electrical interface ( 20 ) for the electrical connection of the SCR module ( 1 ), e.g. B. for power and / or data exchange. Internal combustion engine system ( 2 ), comprising - a reciprocating internal combustion engine ( 3 ), in particular only a reciprocating internal combustion engine ( 3 ), - several SCR modules ( 1 ) for exhaust gas treatment, - an exhaust pipe ( 24 ) for conducting the exhaust gas from the reciprocating internal combustion engine ( 3 ) to the SCR module ( 1 ), characterized in that the SCR modules ( 1 ) are connected in parallel with respect to the exhaust gas and the multiple SCR modules ( 1 ) in each case a housing and / or a frame, an exhaust line ( 7 ), which defines a flow channel for the passage of exhaust gas, with an inlet opening ( 8th ) for introducing the exhaust gas and an outlet opening ( 9 ) for discharging the exhaust gas, one inside the flow channel arranged SCR catalyst ( 10 ), at least one injection element ( 11 ) for adding a reducing agent to the exhaust gas conducted through the flow channel, at least one conveying device ( 13 ) for supplying the reducing agent to the injection element ( 11 ) with a predetermined pressure. Internal combustion engine system according to claim 6, characterized in that the SCR modules ( 1 ) are formed according to one or more of claims 2 to 5 and / or the exhaust pipe ( 24 ) a branching ( 25 ) for the parallel conduction of the exhaust gas from the reciprocating internal combustion engine ( 3 ) into the SCR modules ( 1 ) having. Internal combustion engine system according to claim 6 or 7, characterized in that the SCR modules ( 1 ) are identically formed and / or the reciprocating internal combustion engine ( 3 ) is a diesel engine and / or all SCR modules ( 1 ) are connected in parallel with respect to the exhaust gas. Internal combustion engine system according to one or more of claims 6 to 8, characterized in that the SCR modules ( 1 ) identical exhaust strands ( 7 ) and / or identical SCR catalysts ( 10 ) and / or identical exhaust gas interfaces ( 22 ) for introducing and removing the exhaust gas and / or identical hydraulic interfaces ( 18 ) and / or identical electrical interfaces ( 20 ) and / or the reducing agent is ammonia or a urea solution. Internal combustion engine system according to one or more of claims 6 to 9, characterized in that the internal combustion engine system ( 2 ) a reducing agent interface ( 26 ), in particular only one reducing agent interface ( 26 ), for hydraulic connection to a reducing agent tank ( 27 ) and / or the internal combustion engine system ( 2 ) a particle filter ( 6 ) for the exhaust gas and / or in the exhaust pipe ( 24 ) no obturator, z. B. shut-off valve, in particular for individual SCR modules ( 1 ) is arranged. Internal combustion engine system according to claim 10, characterized in that the reducing agent interface ( 26 ) with a reducing agent main supply line ( 29 ) and a reducing agent main return line ( 30 ) hydraulically with the SCR modules ( 1 ), in particular all SCR modules ( 1 ), in particular the reducing agent main supply line ( 29 ) and the reducing agent main return line ( 30 ) hydraulically with the hydraulic interfaces ( 18 ) on the SCR modules ( 1 ) are connected. Internal combustion engine system according to one or more of claims 6 to 11, characterized in that the internal combustion engine system ( 2 ) a control and / or regulating unit ( 31 ), in particular only one control and / or regulating unit ( 31 ), for the SCR modules ( 1 ) and preferably for the reciprocating internal combustion engine ( 3 ). Internal combustion engine system according to claim 12, characterized in that the control and / or regulating unit ( 31 ) with at least one control and / or power main line ( 32 ) electrically with the SCR modules ( 1 ), in particular all SCR modules ( 1 ), and the at least one control and / or power main line ( 32 ) electrically connected to the electrical interfaces ( 20 ) of the SCR modules ( 1 ) connected is. Method for producing an internal combustion engine system ( 2 ), in particular an internal combustion engine system according to one or more of claims 6 to 13, with the steps: - provide at least one reciprocating internal combustion engine ( 3 ), in particular only one reciprocating internal combustion engine ( 3 ), - provide several SCR modules ( 1 ), - provide an exhaust pipe ( 24 ), - connecting the exhaust pipe ( 24 ) with the reciprocating internal combustion engine ( 3 ) and the SCR module ( 1 ), characterized in that the plurality of SCR modules ( 1 ) parallel with respect to the exhaust gas with the exhaust pipe ( 24 ) with the reciprocating internal combustion engine ( 3 ) and the SCR modules ( 1 ) to the extent that the SCR modules ( 1 ) in each case a housing and / or a frame, an exhaust line ( 7 ), which defines a flow channel for the passage of exhaust gas, with an inlet opening ( 8th ) for introducing the exhaust gas and an outlet opening ( 9 ) for discharging the exhaust gas, an inside the flow channel arranged SCR catalyst ( 10 ), at least one injection element ( 11 ) for adding a reducing agent, e.g. As ammonia or a urea solution, to the guided through the flow channel exhaust, at least one conveying device ( 13 ) for supplying the reducing agent to the injection element ( 11 ) with a predetermined pressure. Method according to claim 14, characterized in that the SCR modules ( 1 ) to the extent that the SCR modules ( 1 ) according to one or more of claims 2 to 5 and / or identical SCR modules ( 1 ) and / or the SCR modules ( 1 ) with identical exhaust gas strands ( 7 ) and / or identical SCR catalysts ( 10 ) and / or identical exhaust gas interfaces ( 22 ) for introducing and removing the exhaust gas and / or identical hydraulic interfaces ( 18 ) and / or identical electrical interfaces ( 20 ) and / or the greater the power of the reciprocating internal combustion engine ( 3 ) or the power of the sum of reciprocating internal combustion engines ( 3 ), the larger the number of SCR modules ( 1 ) and with respect to the exhaust gas in parallel with the reciprocating internal combustion engine ( 3 ) get connected.

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